Agreed! I'm 6'5" & have hands that can reach just about anything. My comment is about my picking/plucking hand though; I've had several fine instruments that have a 19mm string spacing, & for the life of me, I hate them. I've switched almost exclusively to 18mm or narrower.I'm 6'4" with proportionately large hands, but much prefer short scale. In fact I regularly play a 25" scale bass, though I do feel kinda cramped in the upper frets. Nothing wrong with 30" scale, your friend can do whatever he wants, but you do what's right for you.
Buy what works for you!